[Reed]

water injection is a great idea but it should not be used as an octane booster. it is great for a turbo system that is running at its absolute maximum boost level and using water injection to create a margin of error for bad fuel or a sudden drop in fuel pressure or for anything else that may go wrong. Many people see it as a bandaid for a bad tune. Of course water injection can be used to increase boost but I would say to use for safety reasons or maybe for a slight and momentary increase in boost.